Swansea Coroner's Office has told ITV News that further tests will now be carried out on Gareth Colfer-Williams, which are expected to take six to eight weeks.
His family have raised questions about the medical care he received in the days before his death.
More top news
Blackwood mother Trudy Jones was on holiday when she was gunned down in the Tunisian beach massacre that claimed the lives of 30 Britons.
The pair, including a man in his 50s, were struck around midday on the Pen y Fan mountain range in Powys, mid-Wales.
The former Wales international and convicted rapist Ched Evans is expecting a baby with his fiancee, Natasha Massey.